The box has high strength, high impact, absolute seal, moisture-proof, dustproof, waterproof. Enclosed ultrahard square sponge . Characteristic1. ... of anti-impact engineering plastic injection molding ( as well as General ABS plastic)2. Waterproof rubberstrip is made ... which can manual control the pressure in the box.9. Seal lock is a single injection, ... order a large quantity. Portable tool box JS-05